<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="jquery\jquery.js"></script>
    <style>
        #div1{
            background-color: white;margin: 20px;width: 200px;height: 200px;border: pink 5px solid;
        }
    </style>
</head>
<body>
    <!-- <a href="https://jquery.com">default click action is prevented</a>
    <div id="log"></div>
    <script>
        $("a").click(function(event) {
            event.preventDefault();
            $('<div/>').append('default ' + event.type + ' prevented').appendTo('#log'); //default click prevented
        });
    </script> -->
    <div id="div1"></div>
    <script>
        $(Document).ready(function(){
            alert("hello");
            $("#div1").click(function(){
                $(this).css("backgroundColor","red");
            })
            $("#div1").hover(function(){
                $(this).css("backgroundColor","hotpink")
            })
            $("#div1").mouseout(function(){
                $(this).css("backgroundColor","white")
            })
            // $("div1").one("hover",function(){
            //     // alert(event.data.a)
            //     $(this).css("backgroundColor","hotpink")

        })
    </script>
</body>
</html>